4 pp. / Arizona Know Your Water. / Today, homeowners have access to several water treatment systems to help control minerals and contaminants and to disinfect their water. Nearly half of the homes in the U.S. have some type of water treatment device. Mistrust of public water utilities, uncertainty over water quality standards, concerns about general health issues and limited understanding about home water treatment systems have all played a role in this increasing demand for home water treatment systems. Private well owners also need to provide safe drinking water for their families and have to make decisions as to how to treat their own water sources to meet this need. However, choosing a water treatment system is no easy task. Depending of the volume of water and degree of contamination, the homeowner should consider professional assistance in selecting and installing well water treatment systems. The process of selection is often confounded by incomplete or misleading information about water quality, treatment options, and costs. The following paragraphs outline the major well water treatment options. Further details on types, uses (point of use) and costs of these home water treatment systems are provided in the Arizona Know Your Water booklet. Additional information about Arizonas water sources that can help private well owners make decisions about home water treatment options, can be found in Arizona Well Owners Guide to Water Supply booklet (see references section).

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Photocatalysis has received increasing attention in recent years as an effective technology in wastewater treatment applications. In this project, bismuth molybdate (Bi2MoO6), which is a popular visible-light-driven photocatalyst, was prepared by solvothermal and hydrothermal methods. The synthesis conditions, including thermal reaction temperature, synthesis duration, and precursor stirring time of the solvothermal method were optimized based on the photodegradation of Rhodamine B (RhB) under visible light irradiation. Furthermore, the CeO2/Bi2MoO6 composites with different CeO2 loading content were successfully prepared by the wet impregnation route and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS) and diffuse-reflection spectroscopy (DRS). The photodecomposition of RhB aqueous solution under visible light irradiation indicated that composites showed enhancements in degradation activity and 20 wt% CeO2/Bi2MoO6 exhibited the highest photocatalytic activity which was 24.13% and 83.33% higher than those of Bi2MoO6 and CeO2, respectively. This enhancement could be attributed to the formation of heterojunctions that effectively suppressed the recombination of holes and electrons. Quenching experiments revealed that photo-induced holes and superoxide radicals (O2•-) were the main active species during the degradation process. Reusability was assessed by a set of 5 cycling degradation experiments and the results indicated that the composite could be applied long-term. Moreover, the effect of some operating parameters including temperature, initial pH, catalyst dosage and initial substrate concentration were investigated.